Kung fu Kai

Kai an Ox, is definitely on his own. He knows every master Sifu and doesn't want anyone to know what he knows. So logically, he kills them and takes them out of the physical realm. 

Does he really have any students after they serve him? After all, it took him 500 years to get to chi collector. Or did he take his students chi too after he was done with them? 

Not talking about the kiddie classes. Kai the Ox...all students for real combat. Do they just mysteriously get killed? 

So many masters, so many secrets...too bad the universe is infinite.